A study is performed on the method for design of a miter gate CAD system and some correlative functions of the system.
对船闸人字门CAD系统的设计方法进行了研究，探讨了相关的设计问题。
The principle of theory design and similar design are introduced in this article, and the study about the CAD parameter system for the centrifugal fan are made.
文中介绍了离心通风机的理论设计和相似设计原理，进行了离心通风机参数化CAD系统的结构设计与研究。
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